Method of providing the cylindrical inner surface of a lens mount with rolls and lens mount provided therewith

ABSTRACT

Into the inner surface of a cylindrical lens mount grooves are pressed by means of a roller member so that the material on either side of the groove folds from the general level of the surface into the interior space and form rolls. The diameter between the rolls is then sized to the exact size and the lenses, lens elements and pre-mounted lenses are supported on the rolls.

United States Patent [1 91 Strauch et al.

[4 1 Oct. 9, 1973 METHOD OF PROVIDING THE CYLINDRICAL INNER SURFACE OF ALENS MOUNT WITH ROLLS AND LENS MOUNT PROVIDED THEREWITI-I Inventors:Ernst Strauch, Naunheim; Gerhard Bleier, Atzbach, both of Germany ErnstLeitz GmbH, Wetzlar, Germany Filed: Dec. 13, 1971 Appl. No.: 207,038

Assignee:

Foreign Application Priority Data Dec. 15, 1970 Germany P 20 61 661.9

US. Cl 29/406, 72/113, 350/252 Int. Cl B23q 17/00 Field of Search350/245, 252;

[56] References Cited UNITED STATES PATENTS 3,427,703 2/ 1969 Baade29/406 3,258,838 7/1966 Tilton 29/406 649,341 5/1900 Nevill 72/1132,497,147 2/1950 Washam 350/252 2,465,083 3/l949 Gradisar 350/252Primary ExaminerLowell A. Larson Attorney-Krafft & Wells [5 7] ABSTRACTInto the inner surface of a cylindrical lens mount grooves are pressedby means of a roller member so that the material on either side of thegroove folds from the general level of the surface into the interiorspace and form rolls. The diameter between the rolls is then sized tothe exact size and the lenses, lens elements and pre-mounte d lenses aresupported on the rollsv 1 Claim, 2 Drawing Figures METHOD OF PROVIDINGTHE CYLINDRICAL INNER SURFACE OF A LENS MOUNT WITH ROLLS AND LENS MOUNTPROVIDED THEREWITH BACKGROUND OF THE INVENTION The invention relates tothe mounts of optical lenses,

objectives etc. In particular, it relates to a method of providing theinner surface of a cartridge-shaped mount with rolls between which thelenses are supported.

- It is already known to provide the inner surface of a lens mount withelastic rolls which extend parallel to the optical axis. The rolls exerta pressure on the lenses in radial inward direction so that the lensesare thereby automatically centered.

1n the German Pat. Nos. 1,122,738 and 1,127,110 lens mounts areillustrated which are provided with such elastic rolls. The cartridgeswherein the lenses are retained are subdivided into two halves inlongitudinal direction. The lenses are supported between them and thetwo halves are kept together by a second cartridge.

It is, however, rather expensive to manufacture these prior art rolls inthe mounts. The mounts are provided with grooves and elastic material isinserted into the grooves so that the rolls are formed. Besides, suchmounts comprise three component parts which in itself is a severedisadvantage.

It is therefore an object of the invention to find a method of providinglens mounts with such rolls in a simple and inexpensive manner. And itis a further object to provide the rolls in the mount withoutsubdividing it into two parts.

SUMMARY OF THE INVENTION required size.

In each mount an evenly distributed number of rolls, preferably at leastthree, may be generated which extend in parallel to the optical axis.However, the rolls may also extend along a helical line orin a directionperpendicular to the optical axis.

Preferably, the instrument pressing the groove into the material and thegauging tool are combined to form a unit.

I BRIEF DESCRIPTION OF THE DRAWINGS The invention will be more readilycomprehended from the following description when taken in conjunctionwith the appending drawings, wherein:

FIG. 1 is a longitudinal sectional view of a lens mount provided withrolls, and

FIG. 2 is a cross sectional view of the lens mount of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings,in FIG. 1 a lens mount 2 is schematically shown which has an innerwall 1. As can be seen from FIG. 2 the lens mount is of cylindricalshape and is adapted to receive and hold single lens elements, cementedlenses and also pre-mounted lenses.

The inner wall 1 is provided with rolls 3 extending along the wall in adirection parallel to the optical axis. The rolls are made by guiding apressing tool, preferably a roller member, through the lens mount sothat grooves are generated and a roll folds up on either side of thetool.

The lenses to be mounted are of a slightly smaller diameter than thediameter of the inner wall 1; but they are of a slightly greaterdiameter than exists between the rolls. After producing the rolls, thediameter between the walls is therefore sized to the exact size of thelens diameter so that the lenses are retained between the grooveswithout play.

Folding-up the rolls and the calibration of the exact diameter may beperformed in two different working processes, however, the necessarytools may also be combined to form one unit so that both operations maybe performed in only one working process.

According to the Figures the rolls extend in parallel to the opticalaxis. However, they may also extend in a winding line, i.e. a helicalline. Such helical lines can be imagined if one thinks of the one end ofthe lens mount 2 kept fixed while the other end is slightly wound.Helical lines will be preferred if the lens mount is of a materialthrough which the tool may be easier screwed or threaded than pressed ina straight direction.

By the invented method it is thus possible to provide rolls within thelens mount without subdividing the mount into two parts. Simple toolsmay be used and the quality of the finished product, as regards theexactness of the sized diameter, is greatly superior to prior artproducts.

What is claimed is:

1. A method of mounting lenses, lens elements or premounted lenseshaving a given diameter in a lens mount having a cylindrical innersurface with a diameter greater than said given diameter comprising:

a. pressing at least three evenly distributed grooves into the saidcylindrical inner surface and forming at the edges of each groove twoparallel rolls;

b. sizing the internal diameter generated by said rolls to said givendiameter; and

c. mounting said lenses, lens elements or premounted lenses in said lensmount in contact with said rolls.

t II!

1. A method of mounting lenses, lens elements or premounted lenseshaving a given diameter in a lens mount having a cylindrical innersurface with a diameter greater than said given diameter comprising: a.pressing at least three evenly distributed grooves into the saidcylindrical inner surface and forming at the edges of each groove twoparallel rolls; b. sizing the internal diameter generated by said rollsto said given diameter; and c. mounting said lenses, lens elements orpre-mounted lenses in said lens mount in contact with said rolls.